Piezoelectric/electrostrictive material, piezoelectric/electrostrictive body, and resonance driving device

Abstract

A piezoelectric/electrostrictive material is composed of Mn and a compound of Pb(Zn, Nb)O3—Pb(Ni, Nb)O3—Pb(Zr, Ti)O3. A ratio of a molar amount of Mn relative to a sum of respective molar amounts of Ni, Zn, Ti, Zr, Nb and Mn is at least 0.001 to no more than 0.015. A ratio of a molar amount of Nb relative to a sum of respective molar amounts of Ni and Zn is at least 2.007 to no more than 2.125.

What is claimed is: 
     
       1. A piezoelectric/electrostrictive material comprising Mn and a compound of Pb(Zn, Nb)O 3 —Pb(Ni, Nb)O 3 —Pb(Zr, Ti)O 3 , wherein
 a ratio of a molar amount of Mn relative to a sum of respective molar amounts of Ni, Zn, Ti, Zr, Nb and Mn is at least 0.001 to no more than 0.015, and 
 a ratio of a molar amount of Nb relative to a sum of respective molar amounts of Ni and Zn is at least 2.007 to no more than 2.125. 
 
     
     
       2. The piezoelectric/electrostrictive material according to  claim 1  expressed by the general formula Pb x [(Zn 1/3 , Nb 2/3 ) a  (Ni 1/3 , Nb 2/3 ) b  (Ti c , Zr d ) Mn e  Nb f ] O 3  (wherein 0.98≤x≤1.00, 0.2≤a+b≤0.3, 0.35c≤0.45, 0.3≤d≤0.4, 0.001≤e≤0.015, 0.002≤f≤0.025, 2.007≤(2a+2b+f)/(a+b)≤2.125). 
     
     
       3. The piezoelectric/electrostrictive material according to  claim 2 , wherein
 a sintering temperature is no more than 1100 degrees C. 
 
     
     
       4. The piezoelectric/electrostrictive material according to  claim 1 , wherein
 a sintering temperature is no more than 1100 degrees C. 
 
     
     
       5. A piezoelectric/electrostrictive body composed of a piezoelectric/electrostrictive material containing Mn and a compound of Pb(Zn, Nb)O 3 —Pb(Ni, Nb)O 3 —Pb(Zr, Ti)O 3 , wherein
 a ratio of a molar amount of Mn relative to a sum of respective molar amounts of Ni, Zn, Ti, Zr, Nb and Mn is at least 0.001 to no more than 0.015, and 
 a ratio of a molar amount of Nb relative to a sum of respective molar amounts of Ni and Zn is at least 2.007 to no more than 2.125. 
 
     
     
       6. The piezoelectric/electrostrictive body according to  claim 5  wherein,
 a mechanical quality factor Qm is at least 150. 
 
     
     
       7. The piezoelectric/electrostrictive body according to  claim 6 , wherein
 a piezoelectric constant d 31  is at least 180 pm/V. 
 
     
     
       8. The piezoelectric/electrostrictive body according to  claim 6 , wherein
 a Curie temperature is at least 300 degrees C. 
 
     
     
       9. A resonance driving device comprising;
 the piezoelectric/electrostrictive body according to  claim 6 , and 
 a pair of electrodes connected to the piezoelectric/electrostrictive body. 
 
     
     
       10. The piezoelectric/electrostrictive body according to  claim 5 , wherein
 a piezoelectric constant d 31  is at least 180 pm/V. 
 
     
     
       11. The piezoelectric/electrostrictive body according  claim 10 , wherein
 a Curie temperature is at least 300 degrees C. 
 
     
     
       12. The piezoelectric/electrostrictive body according to  claim 5 , wherein
 a Curie temperature is at least 300 degrees C. 
 
     
     
       13. A resonance driving device comprising;
 the piezoelectric/electrostrictive body according to  claim 12 , and 
 a pair of electrodes connected to the piezoelectric/electrostrictive body. 
 
     
     
       14. A resonance driving device comprising;
 the piezoelectric/electrostrictive body according to  claim 10 , and 
 a pair of electrodes connected to the piezoelectric/electrostrictive body. 
 
     
     
       15. A resonance driving device comprising;
 the piezoelectric/electrostrictive body according to  claim 5 , and 
 a pair of electrodes connected to the piezoelectric/electrostrictive body.